Adjusting-jack.



c. s. EHRHART.

ADJUSTING JACK.

APPLICATION IILBD MAE-13, 1908.

Patented Nov. 17,- 1908.

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G SLEHRHART.

ADJUSTING JACK.

APPHUATION- nun-m3. 1a,- 1903.

903,849. l Patented Nov. 17,1908.

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ADJ USHNG JACK Amus-rtn 50mm v ADJUSTER l0 mans-ran s21- scazwADJUSTERTEE sour =o\.\suan ROD STUFHNG BOX TUBING 'ro wliLLx;

Wrruasszs W I v I ATTORNEY UNITED STATES PATENT OFFICE.

CLIFTON S. EHRHART, OF FRANKLIN, PENNSYLVANIA.

ADJUSTING-JACK.

N 0. 903,849. Specification of Letters Patent. Patented Nov. 17, 1908.Application filed March 13, 1908. Serial No. 420,974.

To all whom it may concern:

Be it known that I, CLIFTON S. EHRHART, citizen of the United States,residing at Franklin, in the county of Venango and State ofPennsylvania, have invented certain new and useful Improvements inAdjusting-Jacks, of which the following is a specification, referencebeing had therein to the accompanying drawing.

The object of my invention is to provide a device by means of which thepolished rod, and the thereto attached sucker-rod, of an oil well may bequickly and easily adjusted without stopping the operation of thepumping machinery.

The construction and application of my device will be fully understoodby a reference to the accompanying drawings which form a part hereof andin which- Figure l is a front elevation. Fig. 2 is a front elevationpartly in longitudinal section. Fig. 3 is a side elevation. Fig. 4C is aplan view. Fig. 5 is a section on line V V of Fig. 2. Fig. 6 is asection on line VI, VI of Fig. 1. Fig. 7 is an elevation of the upperportion of an oil well, showing the application of -my adjusting jack.

The construction of my improved jack is in Fig. 7; said jaw is actuatedor caused to bear upon said rod by means of the screw 6. When my deviceis in use, the same is placed upon the adjuster 7, as shown in Fig. 7,the polished rod 11 is received by and occupies the slot aforesaid; saidrod is then firmly clamped between the jaw 5 and the opposing side ofhead 4, the wrench is placed upon the screw portion 8 of the body and asuit able pin 9 is placed in one of the holes of the base 3, by means ofwhich screw 2 may be prevented from revolving. By loosening the adjusterset screw 10 and turning body 1 by means of the wrench 8, the polishedrod,and the thereto attached sucker-rod may be. raised or lowered asdesired, and when the desired adjustment is secured, the adjuster setscrew is tightened and my adjusting jack may be removed.

Having thus described my invention, what I claim and desire to secure byLetters Patent is:

dinally-slotted screw adapted to be coopersubstantially as follows Alongitudinallya ly received in said chamber, said body, slotted,internally-threaded body 1, is head and screw being adapted to therecepadapted to receive into the lower end thereof tion of a polishedrod longitudinally therethe longitudinally-slotted,eXternally-threadthrough, and means in said head adapted to ed screw 2,which is provided with the suit the engagement of said rod.

ably enlarged base 3. Upon the upper end In testimony whereof I affix mysignature of said body is mounted a swivel head 4, in presence of twowitnesses.

which is also correspondingly slotted with CLIFTON S. EHRHART. body 1and screw 2. Within said head is a Witnesses: jaw 5, seated at one sideof the slot, and E. R. INMAN,

adapted to grip the polished rod as shown HOMER R. BLAIR.

